Why not play some word games such as : Hang Man, Whirly Word Anagrams, Alphabet Soup, Scrabble, ETC
They have Free Word Games that will definitely help you out with your spelling on Apple Apps . Or You Can also buy some word search or word games books from the bookstores As well - believe it or not this will also help you out with your spelling as well and are quite Fun actually ! I hope this information helps Helps You out ! :)
I've helped a couple different people, I'd read a word and have them spell it when missed write it 5 times, go back over the words again then what's missed written 10 times... Over and over until no words were missed, each time adding an extra 5 times to it. If it is for any words not just spelling words, make a list of about 20 words at a time to work on.